121400100 has 72 divisors (see below), whose sum is σ = 390287520. Its totient is φ = 32372640.

The previous prime is 121400099. The next prime is 121400129. The reversal of 121400100 is 1004121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19782 + ... + 25181.

It is an arithmetic number, because the mean of its divisors is an integer number (5420660).

Almost surely, 2^121400100 is an apocalyptic number.

121400100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121400100 is an abundant number, since it is smaller than the sum of its proper divisors (268887420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121400100 is a wasteful number, since it uses less digits than its factorization.

121400100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44986 (or 44973 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 121400100 is about 11018.1713546305. The cubic root of 121400100 is about 495.1533042147.

Adding to 121400100 its reverse (1004121), we get a palindrome (122404221).

The spelling of 121400100 in words is "one hundred twenty-one million, four hundred thousand, one hundred".